$OpenBSD: patch-internal_h,v 1.1 2016/11/19 12:27:32 sthen Exp $
--- internal.h.orig	Thu Nov 17 14:20:04 2016
+++ internal.h	Thu Nov 17 14:20:23 2016
@@ -132,6 +132,7 @@ typedef unsigned short sa_family_t;
 #include <netinet/icmp6.h>
 #include <netinet/tcp.h>
 #ifdef HAVE_NETINET_TCP_VAR_H
+#include <netinet/tcp_timer.h>
 #include <netinet/tcp_var.h>
 #endif
 #include <netinet/if_ether.h>
